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6. (18pt) Consider a Feistel cipher with four rounds. Then the plaintext is denoted as P= (Lo, Ro) and the corresponding ciphertext is C =

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6. (18pt) Consider a Feistel cipher with four rounds. Then the plaintext is denoted as P= (Lo, Ro) and the corresponding ciphertext is C = (L4, R4). What is the ciphertext C, in terms of Lo, Ro, and the subkey, for each of the following round functions? (a) (2pt) F(Ri, Ki) = 0 (b) (3pt) F(Ri, K;) = Ri (c) (5pt) F(Ri, K;) = Ki (d) (8pt) F(Ri, K;) = R; OK

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